Paper-bag-making machine or the like



Jan 6, 1931. P. G. ROBINSON ET AL PAPER BAG MAKING MACHINE OR THE LIKE Filed June 1, 1927 3 Sheets-Sheet l w w n T v Wfi nv ew ,mmu 0 I n IMAM w n 4 2, AW my wwoma M u M n 8 we 2 we P Md 9 AM... Wu 9 2 00 u 2 A 1 n w oo h 2 026 7.. 6

Jan 6, 1931. P. e. ROBINSON ET AL 1,787,549

PAPER BAG MAKING MACHINE OR THE LIKE Filed June 1, 1927 5 Sheets-Sheet 2 7 6- foo 111.54 a "o n Maur l5 Jan 6, 1931. P. G. ROB!NSON ET AL 1,787,549

PAPER BAG MAKING MACHINE OR THE LIKE Filed June 1, 1927 6 Sheets-Sheet 5 m 1 @W 3 "W M as m4 W 3 P Patented Jan. 6, 1931 UNITED, STATES PATENT oer-ice PERCY GOTCH ROBINSON TOM SARGENT, OI WHITEHALL, BRISTOL, ENGLAND,

ASSIGNORS TO STRACHAN 86 HENSHAW, LIMITED, 01' WHITEHALL, BRISTOL, ENG- LAND IAPER-BAG -HAKING MACHINE OR THE LIKE Application filed June 1, 1927, Serial No. 195,813, and in Great Britain lune 8, i928.

This invention relates to machines for making paper bags, packets or the like of the type wherein a transverse portion of a surface element is folded up in itself and adhesively secured, or to mechanisms associated with machines of this class.

For the sake of convenience and clarity, the invention will hereinafter be described in association with a machine of known kind for making paper bags wherein paper in a continuous web is drawn from a roll, folded longitudinally on formers and pasted to form a continuous tube which is severed into appropriate lengths for bag lengths, and the bag blanks are then folded transversely at their end margins which are pasted or adhesively secured to the body of the blanks to form the closed bottoms of the bags.

In the art concerned with making paper bags and the like from a continuous web or tube which is severed i'nto lengths, folded transversely and the folded portion secured by adhesive, considerable difiiculty has been experienced in effecting the folding and pasting operations without trouble arising, particularly at high speeds.

In connection with known bag-making machines of the above kind, various proposals have been'made for providing means adapted temporarily to grip the fold of the bag within the slot to prevent displacement of the bags. For example it has been proposed to fold the end of a bag into a slot-like part upon the folding roll, formed by or between a fixed edge thereof and a gripper blade which constitutes one side of the slot formation and which is adapted to move across the slot togrip the folded part.

The object of the present invention is to obviate difliculties which have been found to occur in connection with known machines or mechanisms, particularly when such are operated at-high s eeds, and to provide speeds with mechanical accuracy and reliability.

Inmachines where the bag is folded against a gripper blade uniform and even folds of the bags are difficult or impossible to attain and in contradistinction to arrangements of this kind, according to the present invention the bag is folded independently of any gripping device between the fixed edges of a slot formed in or upon the folding roller, while the gripping blade is adapted subse uently to come Into operation to engage the formed fold. ,The folded part may be gripped or engaged by a gripper device or means operating inward or below the edges of the slot. For example, the folding means may comprise a rotary dipper blade or device adapted to press or fold the end margin of the bags carrying roll or member, characterized by the feature that said bar receives its supply by removing or wiping oft paste from the roll or member in a series'of contiguous lines or 7 zones, as by making the movement of the paste-carrying surface appropriately slow inrelation to the operations of the paste-applying member. 7

It is preferred that the pasting device is in the form of a blade or bar having a pastebearing portion which'is grooved, countersunk or rabbeted in order that it may carry with it from the a-ste roll and retain a compact elongated c arge or thin line ofpaste rather than a mere surface layer thereof.

According tothe invention the paste box adapted to supply the paste roll with a layer of paste is preferably pivotally or displaceably mounted so that the paste roll may be moved into a position in which it is out of reach of the pasting blade. The paste roll intersects or entersaportion of the paste ing blade box and the layer of paste carried away bythe paste roll may be governed or controlled by an adjustable slideor gate.

In the accompanying drawings:-

Figure 1 is a side elevation partly in sec: tion of folding, pasting mechanism and associated )arts, constructed according to one form of the invention.

Figure 2 is a section taken on the hue A'-B of Figure 1. I

Figures 3 and 4 are diagiinmnatlc representations of the asting and folding operations, Fi ure 3 a o showing an alternative form of olding and gripping device for the ba s. 15 Figure is a diagrammatic sectional side elevation of pasting and folding mechanism and a modified form of drive for a paste-carrying roller.

In carrying the invention into effect according to one convenient mode, as applied by way of example to paper-bag-making-machines, the end of the machine from which the bag blanks are delivered is provided with a c linder 1 of metal or other suitable materia rotatablymounted on bearings upon a shaft 2 carried in the side framesof the machine. This cylinder is referred to hereinafter as the folding roll. This roll may be suitably driven through a gear 22 and is usually adapted to make one revolution for each bag received, rotation being capable of be ing effected athigh speed.

The surface of the roll is provided with a narrow'slot 1a transverse to thetravel of the bag and parallel to the axis of the roll in which the end margins of the bags are adapted to be folded. This slot communicates inwardly with a transverse recess or cavity 16 or with the interior of the cvlinder (in thecase in which it is made hollow, see Figures 3 and 5) adapted to accommodate a gripping device according to the invention.

The gripping device comprises preferably athin flexible steelblade 3 inounted'upon a transverse bar or shaft 3a in a plane displaced from the axis of the shaft or the blade may be carried by an element extending from a rock shaft or'carried upon arms 3b or a frame mounted upon the rock shaft or pivots 30, see Figures 3 and 5).

The preferred position of the pivot 3a or pivoted axis of the shaft 3a is considerably eccentric or displacedwith respect to that of the-roll and disposed slightly forward of the folding slot 1a taking the direction of rotation of the roll into consideration. In determining the position of the pivot the factor should be taken into consideration that the foldedportion of the bag should be gripped between substantially parallel surfaces and thatin the present case'the resilience of the grip is attained by the use of a flexible member. A mounting for the fold- 5 ing blade as above described should be such maybe provided to. afl'orda means of varythat the edge of the blade 3 in its movements describes an are which intersects the circumference of the roll adjacent the folding slot and the movement is such that,'and accommodation is provided so that, the gripper normally or in'its inoperative position lies below or under cover of thepart forming the rear of the slot.

The gripper blade 3 may be given the requisite oscillatory movement by any suitable means so that it functions in synchronism with a dipper device for folding the bag margin into 'the folding slot. For example, the rocking shaft 3a may have fixed thereto an arm or lever 30 located at one end of the c linder. This arm or lever or the arm 3b igures 3 and 5) carries a roller 3d adapted to engage a cam 4 fixed coaxially with the shaft 2 or a trunnion of the folding roll. The cam roller may be maintained in contact with its cam by any suitable form of spring means, such as 5. The cam 4 is preferably made so that its angular position may be adjusted in order to alter the timing of the device as desired. Interchangeable cams ing the timing or operation of the gripper 3.

It will be observed that as the roll revolves about its shaftthe cam 4 will cause the rock shaft 3ato oscillate the gripper blade 3 and cause it to en age the forward side of the slot 10; and hold the folded bag for a predetermined period corresponding with an are of the revolution of the folding roll.

The folding slot 1a may be formedintegral with the cylinder constituting. the folding roll as by casting, see .for example Figures 3 and 5, or the cavity accommodating the gripper blade (Figure 1) may be provided at its outer portion with a pair of late members 1b, 1a which may be adjustably secured to provide a foldin slot of variable width. The forward edge 0 the folding slot or plate 16 is preferably located in a radial plane of the roll and is .of a depth or thickness such as to afford a suitable bed or gripping surface against which the gripper blade 'may operate to engage and hold the folded margin of the bag while the rear or following. side of the slot is cut away or provided with a clearance to allow for the arcuate or oscillatory movement of the gripper blade and to provide accommodation for the gripper below the rear part of the slot. Where a separate plate, such as 10, is employed in conthe necessary clearance. The width of the slot may be varied by adjustably mounting the plates 16, 10. Y

The bag is folded into the folding slot by l the action of a rotating dipper device which may be conveniently providedtin the form of' a flexible blademember 6 (Fig. 1) or integral rib 7 (Figures 3 and 5) carried by a rotatable upper roll or support and it will be understood that the dipper in conjunction with the fixed edges of the slot performs the 5 folding operation of the gripper device. The

roller or support for the dipper may be a mutilated roller comprising two end pieces or drum heads 8 having an intermediate disclike part 8a of slightly larger diameter than 10 the parts 8. The purpose of the part 8a is to hold down or prevent the middle part of the bags from rising. This blade 6 or rib 7 is adapted to synchronize with the folding slot 1a so that it meshes therewith andfolds the bag margin into the slot slightly in advance of the 0391'21l1l0l1 of the gripper member 3, which su sequently functions to engage and grip the preformed fold.

While the dipper may be formed integral wvith its roller or support, it is preferred to provide it in the form of a thin flexible blade, as shown in Figure 1, detachably or adjustably fitted to the upper roller. For example, the blade 6 may be adjustably secured by the aid of slots 6a to a bar 6?) mount ed within a longitudinal cavity 9 in the dipper roller or support and secured to the heads 8 at 85, the disc 806 being also formed .with a cavity 80 to accommodate the dipper and a pasting device to be presently described.

For the purpose of applying paste or adhesive to the bag in the appropriate situation before or as folding is taking place, the

dipper roller or support carries or accommodates a radially arranged longitudinal past-- ing bar 10 dfsposed adjacent the dipper member and preferably adjustable radially and in relation thereto as will hereinafter appear.

40 The pastingbar 10 is adapted to be reciprocated radially so that the path 10a (Figure 1) described by its outer extremity is eccentric to that of the roll in association with which it is carried. At a suitable point in'its eccentric path the bar 10 is adapted to gather ner for example the dipper bar may be carried by or connected to a pair of eccentric sheave members 12 disposed with recesses 12a formed in the heads 8 and mounted upon fixed eccentrics 13 so that as the roll revolves the pasting end of the bar as it approaches (see Figure 1) the folding slot protrudes only suflicientl y to deposit its charge of paste upon the bag (sceposition shown in Figure 3) and then recedes inwardly of the dipper blade during the folding operation. When, however, the folding operation has been completed, the dipper and the pasting bar are rotated into a position in which the pasting bar is intended to gather a fresh supply of paste from the paste roll 11 (see Figure 4). In this position the pasting bar, owing to the eccentric mounting, is protruded above the The rate of relative revolution is :H'ljllstml so that ateaoh revolution the pasting bar removes or wipes off from the paste layer 110 (Figures 3, 4 and 5) a narrow zone or line of paste longitudinally across the width of the roll, and at each succeeding revolution contiguous lines or zones of paste are successively removed, as exemplified at 11/) (Figure 3), thus ensuring that the paste is cleared from the roll as it revolves and a substantially clean (roll) surface is returned to the paste box or other source of supply. By this means it will be observed that a high rate of pasting operation can be attained while cleanliness is preserved, eliminating any tendency for paste to be thrown by the paste-carrying roll 11 by centrifugalforce.

To facilitate the removal of the paste from the paste roll in the manner above described,

recess is afforded.

The paste-carrying roll 11 may be supplied from a paste box 14 of known general kind and the quantity of paste carried away upon the roll may be varied by means of a sliding gate 14a, the position of which relative to the periphery of the roll is adjustable by the aid of a screw 14?) or other device. The paste box is preferably mounted upon the extensions of the paste roll spindle 11b and for this purpose is provided with a pair of sleeve members which are carried in cradles 15 which have open slots to facilitate the removal of the box and roll. The cradles 15 are pivotally mounted upon caps 15a associated with the shaft 24. and carry a rotatable shaft 240 upon an extension thereof. This shaft 240 has a pair of eccentrics 16 keyed thereto. Each eccentric is provided with a sheave link member 16!; pivoted to the side frames of the machines or other fixture. The shaft 240 has a handle 17 whereby it and the eccentrics may be rotated so that the paste box and roll may be caused to oscillate about the cradle PlVOtS. A set screw 17a affords a convenient means for locking the paste box and roll in an adjusted position. This oscillatory movement-enables the paste roll to be moved or raised to a position in which its periphery is out of reach of the appropriately disposed Ian pasting bar as it passes, thus affording a convenient means for I ui'ckly putting the pasting operation out o action as may be desired.

Any suitable means may be provided for driving the paste-carrying roll at a veryslow speed, a suitable reduction drive being 1llustrated in Figure 2. The pinion 25 mounted on, the shaft 24 is adapted to mesh with a paste-carrying roll shaft may 15 gear 26 loosely mounted upon a sleeve 27 carried by a stub shaft 28 arranged 1n the extension of the shaft 11?; of the paste roll. To facilitate removal, the stub shaft of the be detachably engaged one with the other y the aid of a tongue and groove or like joint. The gear 27 is held stationary by the pin 31 the sleeve 27a is adapted freely to rotate upon the stub shaft. The pinion 30 causes. the planet pmion 29 to rotate about its axis as it is revolved about the pinion 30 by the gear 26, and to drive the sleeve 27a through its pinion 30a. This drive is communicated to the stub shaft preferably through a spring clutch 32 which is anchored to the sleeve 27a and mounted around a collar 28a on the stub shaft, the arrangement being such that normally the drive through the-clutch causes the spring to bind tightly on the collar and so communicate motion to the stub shaft.

In order to set the position of the pastecarrying roll, or in order to bring a fresh supply of paste into use, the stub shaft may be provided with an extension upon Which a hand wheel 32a may lee-mounted. By rotating this hand wheel in the same direction as that in which it is adapted to be driven, the collar is freed fromthe clutch by reason of the springs unwinding slightly. Similarly by rotating the hand wheel faster than the rotation imparted to the shaft by the driving gear the operator is able to manipulate the paste roll by hand when the machine is in motion. I

In order to press the part of the bag folded by the cooperative action of the dipper, fold ing slot and the gripping blade, a roller 18 is mounted adjacent the roller 1 so that-it operates in rolling contact therewith. This roller is preferably driven at a surface speed corresponding with that of the folding roll 1, T he roller 18 is adapted to press the folded marginal part of the bag into contact with the body of the bagbut in, order that the pressure shall not be applied directly to the pasting line, means are provided such as a transverse cavity or slot 18a. This slot is adapted to register or synchronize, during the rotation of the roller, with the paste line so that while pressure is brought to bearon the bag at either side of the paste line, the paste itself is not actually subjected to the pressing action and, consequently, is preserved from being squeezed out either laterally or on to the body of the bag.

In'conjunction with the pressing roller 18 and in order to ensure that the bags leave the folding roller when released by the gripper blade, 2, series of stripping wires or fingers 19 are provided which extend between the pasting roller and the folding roller (see Figures 1 and 5). The wires 19 are locatedbelow the periphery or surface'of the foldin roller and in order to accommodate them the roller 1 is provided with circumferential slots 10? and the gripping blade 3 is formed with corresponding slots 3e in register with the circumferential slots 1d. The stripping wires 19 are led or given a configuration such that the bag is deflected from the folding roller shortly after its leading end has passed by the pressure roller 18. From the stripping Wires I the bags pass in succession to some suitable form of conveyor device such as a moving felt or cotton belt, tapes or the like, to a drying or pressing device from which they are I delivered. by any suitable mechanism.

The folding and pasting mechanisms above described may be driven and given their appropriate rotations and movements by any suitable means. For example, a gear wheel 20 mounted on the shaft of the roll 8, may receive power transmitted from the bag machine. so that the pasting roll revolves at a suitable rate. The pasting roll has a gear 21 locked to it'laterally by bolts or other means and meshes with a gear 22 similarly locked to the side of the folding roll 1, so that the pasting roll and folding roller rotate in uni son. The gear 21 also meshes with a gear wheel 23 loose upon the transverse shaft 24 to which it is preferably connected by clutch means. For example, a disc 24a may be rigidly mounted upon the shaft 24 and the gear 23 may be locked to the disc 24a by a nut 246.

The purpose of this clutch arrangement is to enable the setting of the gear wheel 23 with respect to the disc 24a and shaft 24 to be varied or angularly adjusted.

According to a modification the relatively slow drive for the paste-carrying roller from the paste-applying roller may be communicated by a device such as shown in Figure 5 in which an eccentric sheave 33 mounted on an eccentric carried by the shaft 40 of the pasting roller, is connected by an arm 34 to a link 34a pivoted coaxially with the paste-apply ing roller 11. This link 3411 carries a pawl 35 which is adapted to engage with a ratchet wheel 36 so that as the link is oscillatedthe pawl 35 drives the paste-applying.roller 11 through the ratchet wheel and. at an appropriately slow speed.

Having now described our invention, what we claim as new and desire to secure by Letters Patent is 1. Means for folding paper bags or the like having a dipper blade adapted in co-operation with a folding roller to fold a transverse portion of a bag blank upon itself and wherein the dipper blade is adapted to co-operate with a slot ,having fixed bag blank engaging edges carried by the folding roller so that the blank is folded between the two edges of the slot, gripping means carried by the folding roller and operative means adapted to actuate the gripping means to engage the folded part subsequently to the formation of the fold.

2. Means for folding paper bags or the like having a dipper blade adapted in co-operation with a folding roller to fold a transverse portion of a bag blank upon itself and comprising a folding roller provided with a transverse slot having bag engaging edges, a d1p per blade adapted to enter the slot to fold the bag blank between the edges thereof, and a resilient gripper blade carried by the folding roller and operative means adapted to actuate the gripper blade to engage the folded part subsequently to the formation of the fold to grip it against the forward edge of the slot.

3. Means for folding bags or the like having a dipper blade adapted in co-operation with a folding roller to fold a transverse portion. ofa bag blank upon itself and comprising a folding roller having a transverse slot and a gripper blade pivoted within the folding roller and positioned so that in 1ts normal position its outer end lies inward of the rear edge of the slot while the blank is being folded into the slot and operative means to pivot the gripper blade to cause it to engage the folded part subsequently to the formation of the fold to grip the fold against the forward side of the slot.

4. Means for folding bags or the like having a dipper blade adapted in co-operation with a folding roller to fold a transverse pori tion of a bag blank upon itself and comprising a resilient gripping blade pivotally mounted within the folding roller the axis of movement of said bladebeing in advance of the forward side of the slot so that in operation the outer edge of the gripping blade has an arcuate path which intersects the circumference of the folding roller at a point coineiding with the forward folding edge of the slot.

5. Means as claimed in claim 3 wherein the rear edge of the slot is undercut to accommodate the outer edge of the gripping blade 1n its normal postion.

6. Means as claimed in claim 4 wherein one edge of the slot is chamfer'ed-to correspend with the arcuate path of the grlpper blade.

7. Means for folding bags or the like having a dipper bladeada ted in co-operation with a folding roller to old a transverse portion of a bag blank u on itself, a pasting means for pasting the olded part and comprisingapressure roller in rolling contact with the folding roller and adapted to press the folded part of the bag, said pressure roller having a transverse slot to accommodate the pasted portion, rotation being given to the roller to cause the slotted part to synchronize with the pasted part or line. b

8. Means as claimed in claim 2 wherein the transverse slot is formed by a pair of plates detachably secured to the folding roller.

9. Means as claimed in claim 2 wherein the transverse slot is formed by a pair of plates one of which is adj ustably mounted upon the folding roller.

10. Means for folding bags or the like having a dipper blade adapted in cooperation with a folding roller to fold a transverse portion of a bag blank upon itself and a pasting means for pasting the folded part, said pasting means comprising a paste carrying member, a rotary paste bar, means for rotating said barto cause it to take a supply of paste from the member and transfer it to the bag .blank, and means for advancingthe paste carrying member to expose a fresh supply to the paste bar, the relative speeds of the paste bar and'the paste carrying member being such that the paste bar removes the paste from the paste carrying member in a series of contiguous zones.

11. Means for folding bags or the like having a dipper bladeadapted in cooperation with a foldingroller to fold a transverse portion of 'a bag blank upon itself and a pasting means for pasting the folded part, said pasting means comprising a paste container, a paste carrying roller receiving paste from said container, means for rotating said roller at a low surface speed, a rotary paste applying bar operatively associated with said roller means for rotating said bar, to cause it to remove a supply of paste from said roller and transfer it to said bag blank, the relative speeds of the roller and bar being such that the paste is removed from the roller in progressive zones so that a ,7 substantially clean surface of the roller is returned to the source of supply.

12. Means as claimed in claim 11 wherein the paste aplying bar is formed with a rabbeted edge whereby it removes a constant predetermined quantity of paste at each operation. r

a 13. ll/Ieans as claimed in claim 10'wherein the paste carrying member is mounted in displaceablebearings and means are provided for displacing such bearings to move the paste carrying member out of the path of a rotary dipper roller and adapted incooperation wlth a folding roller to fold a transverse portion of a bag blank upon itself, and pasting means for pasting the folded part, the dipper blade being'adapted to co-operate with a slot having fixed bag-blank engaging edges carried by the folding roller so that the blank is folded between the two edges of the slot, and gripping means carried m by the folding roller adapted to be brought into operation to engage the folded part subsequently to the formation of the fold, and a rotary paste-applying bar associated with the dipper roller and adapted to receive a supply of paste from a paste carrying roller by removing the paste from the paste carrying roller in a series of contiguous zones by rotating the paste carrying roller appropriately slow In relation to the rotation of the paste applying bar.

11 testimony whereof we have signed our names to this specification.

PERCY GOTCH ROBINSON. TOM SARGENT. 

